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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 462.8 $ 558.0
Partially finished products 317.6 318.3
Finished products 499.0 371.0
Inventories at FIFO cost 1,279.4 1,247.3
Less: Progress / performance-based payments on U.S. government contracts (144.7) (238.0)
Excess of FIFO cost over LIFO cost (74.0) (71.8)
Inventory net 1,060.7 937.5
Component of finished goods inventory $ 175